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Filtering / Vacuum Flasks

Filtering / Vacuum Flasks

Filtering flasks (also known as a vacuum flask) has heavier walls than a standard Erlenmeyer flask to withstand the effects of vacuum filtration. A side arm with hose allows flexible tubing for connection to vacuum pump, aspirator, or house vacuum. While filtration, the filtrate enters and is held in the flask while the sample or residue remains on the filter paper in the funnel. Filter flask can also be used as a vacuum trap in a vacuum line. Select from borosilicate glass, safety-coated glass.

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1 Flask, Buckner, Filtration Bolt Neck

Flask, Buckner, Filtration Bolt Neck

These flasks with tabulation are blown in special mold, in shape designed to give maximum mechanical strength. For convenience, these flasks are gradu...
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2 Flask, Filtering Heavy Wall with Standard Taper Joint

Flask, Filtering Heavy Wall with Standard Taper Joint

Heavy wall Erlenmeyer-shaped filtering flask with standard taper outer joint and serrated hose connection for attachment to vacuum source.
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3 TLG® Flasks, Filtering , Heavy Wall, Safety coating , Tubulation, Graduated

TLG® Flasks, Filtering , Heavy Wall, Safety coating , Tubulation, Graduated

Plastic coating for added safety Heavy-wall borosilicate glass offers mechanical strength for vacuum filtration.
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Frequently Asked Questions

A filter flask is a specialized piece of science equipment used for quick liquid filtration and solid separation, especially if vacuum filtration methods are being employed. It frequently works with a Buchner funnel or other filtration equipment.

An Erlenmeyer flask is a conical flask with a narrow neck and a flat bottom that is mostly used for heating, mixing, and storing liquids. A filter flask is a specific type of Erlenmeyer flask that is made for vacuum filtering. A side arm for attaching to a vacuum source and a larger, heavier wall are features of the filter flask.

In vacuum filtration, a vacuum filter flask, also known as a Büchner flask, is used to collect the filtrate, or liquid that passes through a filter, and to give the vacuum pump a safe place to connect. This glass container features a tapering neck, a flat bottom, sturdy walls, and a side arm for attaching to the vacuum. With this configuration, solids and liquids may be filtered and separated quickly.

A filter flask, a filter funnel or holder, a vacuum source (vacuum pump or water aspirator), and a filter material (such as filter paper or a membrane) are needed for vacuum filtering. To safeguard the vacuum source, certain configurations could furthermore have a trap. 

Here is a more thorough description of the apparatus:

1. Vacuum Source:

  • The negative pressure used to pull liquid through the filter is supplied by the vacuum pump. 

  • Another way to create vacuum is by utilizing compressed water. 

2. Filter Flask (or Buchner Flask): 

The filter media is stored in a customized glass container with a perforated plate (Buchner funnel) and a side arm for attaching to the vacuum source.

3. Filter Funnel or Holder:

  • This funnel is shaped to fit into the filter flask and has a perforated plate at the bottom. 

  • The filter membrane is held in place during membrane filtration. 

4. Filter Medium:

  • Used for general filtration, which separates liquids from solids.

  • Frequently used in analytical or microbiological applications for more accurate filtering. 

5. Optional Equipment:

 

  • According to Southern Labware, a trap is a little flask positioned between the filter flask and the vacuum source to stop liquid from being sucked into the pump.

  • To keep the filter flask firmly in position, use a clamp or retort stand.

  • Tubing: Used to attach the filter flask to the trap and vacuum source.

  • Safety glasses: To keep splashes out of your eyes.

  • Gloves: To shield hands from substances.

A filter flask and Büchner funnel are used for vacuum filtering. In order to effectively separate particles from liquids at lower pressure, this specialty funnel is made to be used with a filter flask.

Usually used with a vacuum filter flask, thick-walled rubber tubing is also known as vacuum tubing. This type of tubing is selected because it is capable of withstanding the pressure generated by the vacuum, which keeps the tube from collapsing and guarantees a good seal. Additionally, quicker filtering is made possible by solid tubing.

Specifically in a vacuum filtration arrangement, a Buchner funnel and a rubber stopper or adapter are required to firmly attach a filter flask. A rubber stopper or adaptor should be used to ensure a tight fit when the Buchner funnel is inserted into the filter flask's neck. 

Yes, filter paper is required for vacuum filtration. A Buchner funnel (or comparable device) is used in vacuum filtering; to catch dust while the liquid is being sucked through, a filter paper or membrane must be put on the funnel's bottom.

A conical flask with a flat bottom, an Erlenmeyer flask, is used to mix, store, and sometimes heat liquids. In essence, a filter flask is an Erlenmeyer flask modified to include a side arm for vacuum filtering. Their principal function is where the primary difference may be found: Erlenmeyer flasks are used for handling liquids in general, whereas filter flasks are made especially for suction-based solid-liquid separation.

Another name for a filter flask is a suction flask, vacuum flask, or Büchner flask. It's specialized lab glassware that's usually used with a Buchner funnel for vacuum filtering. The Büchner flask features a short neck, a sidearm for attaching to a vacuum source, and a flat-bottomed, cone-shaped body.

It's true that an Erlenmeyer flask may be used for vacuum filtration; however, it's crucial to use a Büchner flask, which is a modified version. A standard Erlenmeyer flask could break since it isn't robust enough to handle the vacuum pressure. Büchner flasks are appropriate for this use because of their heavier walls and side arm for connecting vacuum tubing.

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